Konstantin Rubinstein, Marina Zoloeva,Lena Grizan, Sergey Gromov, Lena Egorova Hydrometcentre of Rus

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Konstantin Rubinstein, Marina Zoloeva,Lena
Grizan, Sergey Gromov, Lena Egorova
Hydrometcentre of Russiak_rubin_at_mecom.ru
INTAS 03-51-5296 Workshop Zvenigorod, October
23-26, 2005
Sensitivity of Surface and Air Temperature to
snow albedo, capacity (preliminary results of
numerical experiments of General Circulation
Model)
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Content of report

• General Circulation of Atmosphere models what
  it is?
• Which kind of processes is incorporated there?
• What degree of model we have?
• What is degree of believing it?
• 2. What is the level of snow modeling by this
  model?
• 3. What type of experiments we did this time?
• 4. Degree of surface fluxes Sensitivities to
  snow albedo change.
• 5. Sensitivities of surface temperature to snow
  albedo change.
• 6. Sensitivities of Air temperature, Air
  humidity and precipitation to snow albedo change.
• 7. Sensitivities of Snow to snow albedo change.
• 8. Conclusions

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General Circulation of Atmosphere models what
it is?
PH,

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Numerical Approximation of EquationConditions on
top and Ground Physical processes in the
Atmosphere, on the Ground and condition in
Ocean and Sea Ice
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History of General Circulation Atmosphere models
investigation in Russia
History of General Circulation Atmosphere models
investigation in Russia
 
 
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Comparison of some Russian model results AMIP
What degree of model we have? Can we
believe it?Atmosphere AMIP-1
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1.What degree of model we have? Can we
believe it?Correlation and RMS between model and
climate air temperature near surface for North
Hemisphere Land AMIP - II
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Correlation and RMS between model and climate
precipitation for North Hemisphere AMIP II
)

• ? ?

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Integral characteristics of North America and
Eurasia snow mass in AMIP experiments for 3
Russian General Circulation of Atmosphere model
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Climate Classification of Snow
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Dynamical Classification of Snow
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3. What type of experiments we did?

• AMIP protocol experiments (10 years, CO2
  fixed, TSO-reality)
• Dynamical classification of snow from climate
  data
• 1 exp. - Snow Albedo depend on snow class
• Class Tundra Taiga Mount Sea
  Efem Prairie
• Albedo 0,75 0,65 0,6
  0,57 0,60 0,65
• 2 exp. - Snow Capacity depend on snow class
• In base exp. Csn0.3 ??/??
• Class Tundra Taiga Mount Sea
  Efem Prairie
• KC 0,6256 0,6262 0,6253
  0,6258 - 0,6250
• 3 exp. Snow Conductivity depend on snow class
• In base exp. Ks3.9105 (???)/(?3?)
• Class Tundra Taiga Mount Sea
  Efem Prairie
• K ? 0,11090 0,0519 0,0691
  0,0941 - 0,0786

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Exp 1. Snow albedo Winter 79/80 Up base exp
(a0,8) Down- exp 1
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Difference between Allbedo Base Exp. Exp. 1
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Difference between for NearSurfaceTemperature
in winter (up) and in spring (down)
(Tbase-Tsnal)
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Ex 1Difference between Snow cover for winter
79/80 (up) and spring (down) (Sn base Sn exp
1)
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Year changes in snow classes and and snow WE in
two areas
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Exp 2Ts (up), T air near surf (midl) and diff
(base-exp2) down for 3 regions 1. N. Asia
(160-240el),2.N. Asia (60-120el), 2.N. America
(250-290el)
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Ex. 2 Snow WE change
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Exp. 3Ts (up), T air near surf (midl) and diff
(base-exp2) down for 3 regions 1. N. Asia
(160-240el),2.N. Asia (60-120el), 2.N. America
(250-290el)
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Conclusions

• Dynamical classification of snow incorporated
  into GCM of Hydrometcentre of Russia,
• based on ERA40 climate
• It was running 3 AMIP experiments
• 1 albedo of snow depend on snow class
• 2 capacity of snow depend on snow class
• 3 conductivity of snow depend on snow class
• It was was shown
• In Exp 1
• Mean albedo of North Hemisphere is near etalon,
  but snow classification not doing winter albedo
  better. Detail analysis of albedo in different
  areas give opportunity to separate areas with
  underestimated and upperestimated winter albedo.
• Albedo depend on snow class induce greater
  temperature difference in Spring(untill 3-4C),
  than in Winter (1-2C).
• Snow WE change until 25 75 sm.
• In E?p 2
• It was shown, that difference in snow
  canductivity depend on snow class appeared areas
  with difference temperature of air near surface
  about 6-7C.
• Difference in Snow WE 10-35 sm.

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CONCLUSIONS

• THANK YOU VARY MUCH FOR ATTANTION !!!!!!